Counterintuitive Gaussian pulse sequence in three-level ladder scheme

Abstract

In a recent publication we have studied counterintuitive pulse sequence applied to a three level lad der scheme, utilizing rectangular shaped pulses. In this research we investigate amplification without popula tion inversion in a three level ladder system interacting with two electromagnetic fields, namely, the probe and coupling fields. We take both probe and drive fields in the form of Gaussian shaped pulses. In a counterintuitive sequence scheme, the short probe pulse is introduced prior to the application of the coupling field, in contrast to a regular sequence scheme, where both fields are introduced at the same time. The influence of varying the probe pulse width and time delay between the initiation times of the probe and coupling fields on transient probe gain is investigated. It is found that the system exhibits a kind of memory about previously applied weak probe pulse. This may allow for detection of the past event by applying a strong drive pulse in the future.

Dynamic emission and population control in a Λ-type excitation scheme of atomic potassium

“…We surmise that the nonlinear, wave-mixing media in which such an effect may preferably appear are, among others [17][18][19][20][21], those with partially coherent emissions, whose emission profiles can be temporally manipulatedwith asystem lifetime ofsome hundreds of ns [17][18][19][20][21]. The results from our model strongly suggest that in such systems, gain (figures 8(c) and (d)) will be obtained long after the path-2 cascade emissions have terminated.…”

“…It is noted that in this work,as well as previous work [5,7,8], our study differentiates itself from previous works in the field [1][2][3][10][11][12][13][14][15][16][17][18][19][20][21] for the following reasons: (i) anodipole forbidden transition isinvolved in the four-level system and (ii) the pump laser is the source for the emitted fields, ensuring that the wave mixing of the involved frequencies is the dominant process in the system.…”

Selective excitation of vibrational states in three-state Na2 molecule by a chirped laser pulse

“…Population transfer and coherent control of quantum states have been the subject of many theoretical and experimental studies. Various schemes [1][2][3][4][5][6][7] for controlling population transfer have been proposed over the years. The stimulated Raman adiabatic passage (STIRAP) [4,5] and chirped adiabatic passage [6,7] have played an important role in the development of controlling population transfer.…”

Single-pulse-induced total population inversion between indirectly coupled quantum states

“…There have been other methods based on delayed laser pulses for controlling the dynamics of atoms [25][26][27][28][29][30] and molecules [31][32][33][34], moreover, single pulses have been applied for such purposes too. In the context of single pulse control, usually a frequency chirping [35][36][37][38][39][40] or pulse shaping [41,42] is applied.…”